From nobody Sun Sep 28 16:32:08 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1756307952290426.30073831360676; Wed, 27 Aug 2025 08:19:12 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1urHnQ-0005oX-JI; Wed, 27 Aug 2025 11:10:45 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1urHkx-0000JG-66; Wed, 27 Aug 2025 11:08:12 -0400 Received: from isrv.corpit.ru ([212.248.84.144]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1urHkq-0005pD-FT; Wed, 27 Aug 2025 11:08:09 -0400 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id F16FB14C55C; Wed, 27 Aug 2025 18:02:59 +0300 (MSK) Received: from think4mjt.tls.msk.ru (mjtthink.wg.tls.msk.ru [192.168.177.146]) by tsrv.corpit.ru (Postfix) with ESMTP id DF406269863; Wed, 27 Aug 2025 18:03:26 +0300 (MSK) From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, Keith Busch , Klaus Jensen , Michael Tokarev Subject: [Stable-10.0.4 51/59] hw/nvme: cap MDTS value for internal limitation Date: Wed, 27 Aug 2025 18:02:56 +0300 Message-ID: <20250827150323.2694101-51-mjt@tls.msk.ru> X-Mailer: git-send-email 2.47.2 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=212.248.84.144; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1756307954972124100 Content-Type: text/plain; charset="utf-8" From: Keith Busch The emulated device had let the user set whatever max transfers size they wanted, including no limit. However the device does have an internal limit of 1024 segments. NVMe doesn't report max segments, though. This is implicitly inferred based on the MDTS and MPSMIN values. IOV_MAX is currently 1024 which 4k PRPs can exceed with 2MB transfers. Don't allow MDTS values that can exceed this, otherwise users risk seeing "internal error" status to their otherwise protocol compliant commands. Signed-off-by: Keith Busch Signed-off-by: Klaus Jensen (cherry picked from commit 53493c1f836f4dda90a6b5f2fb3d9264918c6871) Signed-off-by: Michael Tokarev diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c index f34bd68c04..67cb95c809 100644 --- a/hw/nvme/ctrl.c +++ b/hw/nvme/ctrl.c @@ -8339,6 +8339,11 @@ static bool nvme_check_params(NvmeCtrl *n, Error **e= rrp) host_memory_backend_set_mapped(n->pmr.dev, true); } =20 + if (!n->params.mdts || ((1 << n->params.mdts) + 1) > IOV_MAX) { + error_setg(errp, "mdts exceeds IOV_MAX"); + return false; + } + if (n->params.zasl > n->params.mdts) { error_setg(errp, "zoned.zasl (Zone Append Size Limit) must be less= " "than or equal to mdts (Maximum Data Transfer Size)"); --=20 2.47.2